Weird Things in Minecraft

Hey all, lately, minecraft has been getting more and more sophisticated, right? Whilst I was messing around with the snapshot 13w37a, I realised, without the w & a, it spells 1337, along with that, if you goto X = 30,000,000,000 (I think) You cannot travel any farther, then the extreme hills biome is replaced with what looks like snowy cliffs with stone lining the ground, It looks, from it's formation, that something has torn through it, like an enderdragon, since they break any block (Mostly)! Something spells trickery, and possibly the Mojang crew are toying with us, what, with all these new biomes, red dragons? What is behind it all? Or is there nothing there after all?

The wall at the end of the world is a new feature to stop you from falling off, I believe. It mentions this on MCWiki's Upcoming Features.I'm pretty sure the new extreme hills generation is intentional, the snow depending on the Y-Axis.